Even when I agree with Rick Santorum, listening to him argue the point almost makes me change my mind. I also wonder why he’s running for president, rather than governor, when the issues closest to his heart are family- oriented matters about which the federal government can, and should, do very little. It’s strange that Santorum doesn’t seem to understand the crucial state-federal divide bequeathed to us by the framers of our Constitution, inasmuch as it is precisely that difference that underlies his own point that states could ban contraception. Of course they can. States could outlaw purple hats or...